Ore-stamping mill



, ,21 sheetssheet 1. G.. M.l GROSS.

ORBSTAMPING MILL.

No. 538,91. Patente'dlM'a.

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G. M GROSS. ORE STAMPING MILL.

No. 538,961. Patented May 7,1895.

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GEORGE M. GROSS, OF'CHIGAGO, ILLINOIS.

ORE-STAM PING M l L.| .l

sPEcIrcATIoN forming pea ef Lettere Patent' No. 538,961, detect Mey 7,1895. Appneeaen flied August 27, 1891i.' seria No. 521,456. (Ne model.)

This invention relates to that class of stamp Y mills in which the stamphead is lifted by a cam, and falls by gravity alone, or gravity assistedby the elasticity of a spring, to crush the ore or other materialcontained Within the mortar box; and also to Athat particular type ofstamp batteries in which a numberof stamp heads are arranged in a'concentric cluster, and drop in a successive manner during the crushingor stamping operation;

and the present improvements have for their` objects to provide a simpleand efficient means for attaining a positive and differential revolutionin the same direction of the concentrically arranged lifting cam and camtappet of a stamp mill, to effect a continuons change of the face of thestamp head with relation to the face of its stationary anvil block ordie, and so attain an even and uniform wearing away of the stamp head,dac., during continued use; also to provide a simple and durable meansfor increasing or diminishing at will, the force or impact of the stampheads` in their down stroke, and in which such downwardly impellingmeans for the stamp, heads, is capable of adjustment to compensate forwear upon the stamp head by continued use; and finally to provide asimple and durable general construction and arrangement of a clusterstamp battery embodying the features y of the usual stamping action,supplemented by a grinding action due to a positive rotation of vthestamp heads; a yielding connection between the stamp stems and theiroperating cam mechanisms, that takes up in a great measure the jar uponthe operating mechanism, due to the rebound from the downward impact ofthe stamp head, and which at the same time tends to force the face' ofthe stamp head downwardly in a yielding mannerduring the grinding ormulling action of the same,

upon the ore under treatmentg a simple and durable adjustment of thestamp stems, downwardly with relation to their operating cam mechanisms,to 'compensate for Wear of the stamp head by continued use; and aneectvive andsubstantial attachment of the individual stamp heads andoperating cam mechanisms in proper position, in a manner that admits ofthe ready and convenient detachment and replacement of any one stamphead and its individual operating cam mechanism, in making repairs,without disturbing in the least, the functions or actions of theremaining stamps. I attain such objectsby the construction andarrangement of parts illustrated in the accompanying drawings, in which-Figure l is a vertical sectional elevation of a cluster-stamp mill orbattery constructed in accordance with the present invention; Fig. 2, anenlargeddetail sectional elevation of the lifting-cam, eam-tappet, andstamphead stem; Figs. 3, 4, and 5, horizontal sections at lines 0c', x2x2, respectively, Fig. 1.

Similar numerals of reference indicatelike parts'in the several views. j

Asrepresented in the drawings the main supporting frame of the millconsists of a single vupright or post l, at one side, and a pair ofuprights or posts 2, at the other side, which are firmly connectedtogether by the horizontal tie members, 3, LLand 5, that have abifurcated or Y formation, and which are preferably made in the form ot'castings, and provided with suitable flanges by means of which they aresecurely bolted to the posts l and 2, to constitute a rigid andsubstantial supporting frame for the mill mechanism.

At the bottom the posts l and 2,*are bolted to the sides of the base orbottom casting G, that receives and holds the stationary stamp dies 7,and constitutes the bottom of the mortar box.

8are the stamp heads having the usual guide stems 9, by which they areguided in their vertical reciprocating movement.

10, are the lifting cams, and 11, the guide stem tappets.

In the present inventiona series of individual stamps, lift-cams, andtappets, are arranged in a circular ycluster* concentric with the maindriving shaft 12, that carries a spur gear` 13, which meshes with anddrives the series of spur gears 14, that are attached to and form aportion of the lifting cams 10.

Each individual stamp lifting cam 10, is of a cylindrical form, arrangedto surround its individual stampstem 9, and connected thereto by meansof a key or spline l5, secured in the axial bore of the cam and adaptedto have movement in the vertically extending keyway or groove 16, in thestamp stem, so as to admit of the independent vertical reciprocat-ion ofsuch stem, and yetimpart the same rotary motion to such stem and itsstamp head, that is received by such cam from the main driving shaft;and the cam portionproper of the can". is in the form of an upwardlyextending annular rim 10', that is cut away spirally to form thespirally inclined lifting face of the cam, that preferably extendsaround the whole circular surface of the rim to constitute a single liftcam, so that with each complete revolution of the said cam a singlestroke will be imparted to the stamp head.

In order that the portion of the stamp stem in which is formed thekeyway 16, will not at any time pass out of the cam bore and enter theguide box immediately underneath, the body of the cam is extendeddownward a sufficient distance in the form of a hub extension 10, eitherseparate or integral, that rests directly above the aforesaid guide box17, and on the top surface of the lower horizontal tie member 5, tosupport the aforesaid cam in operative position.

Each individual cam tappet 11, of the stamp stems will preferably be ofa counterpart construction with the lifting cams 10, and will consist ofa body portion surrounding the stamp stem 9, and a downwardly extendingrim portion 11', that is cut away spirally, so as to have a uniformbearing upon the adjacent spiral lifting face of the lifting cam l0.

Each tappet has an upward extension 11, the outer periphery of which isof a non circular shape, preferably square as shown, that is adapted tohaveanindependentendwise vertical movement in the guide box 18,0n theintermediate horizontal tie member 4, but held from any rotary movementindependent of such box. Such box 18 may be made a fixture on the member4t, but itis preferable to make it revoluble, as will hereinafter morefully appear.

Each stamp stem 9, is free to revolve independently of its cam tappet,but independent vertical endwise movement of the two is prevented bymeans of the top and bottom confining collars 19 and 20, secured to the'stamp stem 9 above and below the cam tappet as shown. In the presentimproved construction these collars are made adjustable on the stampstem, so that said stamp stem can be let down throughthe cams, tocompensate for Wear of the stamp head in continued use. In this, 21, isa vertical `series of notches at each side of the stamp stem,

placed, say one inch apart, and 22, shows vertical, pairs of counterpartnotches or orifices through the collars 19 and 20, placed one and onehalf inches apart, so that when one pair of the orifices 22, is in linewith a pair of the notches 21, in the stamp stem, to receive the pair ofconnecting pins or gibs 23, the other pair of the orifices 22 will beone half an inch away from the next adjacent pair of the notches 21, ofthe stamp stem. By this means successive adjustments of one half incheach `can be readily effected to compensate for Wear of the stamp headby continued use; and it is quite evident that a greater or lessadjustment may be effected by a nearer or farther apart arrangement ofthe series of notches and orifices 21 and 22.

24:, is a spring cushion interposed between the lower collar 20, and theunder surface of the body of the tappet ll, so as to admit of a limitedindependent vertical movement between the parts in use, and constitute ayielding connection at such point, that will absorb in a great measurethe jar upon the camsand other operating parts, due to the rebound fromthe downward impact of the stamp head, and which at the same time actsto force the face of the stamp head downward in a yielding manner,during the grinding or mulling action of the same upon the ore undertreatment.

The cluster of stamps will be usually five in number, and the same willbe supported and guided in proper position by the guide boxes 17 and 18,on the vertical and outer faces of the intermediate and lower horizontaltie members 4 and 5 of the main frame, and as so arranged permits of theready removal and replacement of any one stamp and its individualconnections, iu making repairs, without disturbing in the least theaction or function of the remaining stamps.

In my preferred arrangement as illustrated in Figs. l, 2 and 3, of thedrawings, I arrange the guide boxes 18 of the cam tappet to havedifferentially slower motion than the operating cams and stamps, and iuthe same direction, so as to effect a change at each stroke of the stampheads, of the face of such heads with relation to the face of thcirdies,by giving an advancing part turn to such heads. In this construction theguide boxes are journaled to revolve in the intermediate horizontal tiepiece 4, and are provided with concentric spur gears 25, that form acluster around and mesh with a central driving spur gear 26, that isarranged upon a hollow shaft 27, surrounding the main vertical shaft 12.

Motion is communicated to the hollow shaft 27, in any suitable mannerpreferably by means of a horizontal countershaft 28, carrying at itsinner end a bevel gear 29, meshing with a bevel gear 30 on thehollowshaft, and at its outer end provided with achain or other pulley31, connected to and driven by a cor- IOO IlO

responding chain or other pinion 32, on the main driving `shaft 33 ofthe machine and which will usually be arranged in suitable boxes at thetop ot' the mill, and connected to the vertical'driving shaft 12 bymeans of a pair of bevel gears as shown. The driving shaft 12, issupported atits lower end in a step bearing at the central portion ofthe lower horizontal tie member 5, as shown. I

The relative diameters of the chain wheel 3l, and the chain pinion 32,will regulate the slower revolutionsof the cam tappet with relationtothe revolution of the operating cam, and will vadord a ready means forchanging such relative rotations, by substituting chain wheels andpinions of the required relative diameters. f

The mortar box 34 surrounding and inclosing the circular cluster ofstamp heads will be of any usual construction, having its sides providedwith the usual detachable pulp screens 35 and its top with the usualfeed hopper 36. 37, is a top plate that may form preferably the top orcover of the mortar box, and'which plate in the present invention isarranged a short distance below the horizontal lower tie member 5, andprovided with upturned marginal tianges 38, so as to form a wastereceiving recess or chamber that is packed with cotton or other waste.Thiswaste surrounds the cluster ot' stam p stems, and constitutes awiper therefor, so as to prevent the passage of'any oil or lubricantdown from the guide boxes into the mortar box.

39, is,an annular pulp collecting trough at the bottom of the mill orbattery for treceiving the pulp discharged through the screens of themortar box in the operation of the stamp battery.

' The cluster stamp battery so far described, constitutes a very ecientgravity drop battery, and in larger sizes will usually be soconstructed, but in the smaller sizes of stamp batteries, such forinstance as prospecting mills, in which great lightness combined withcrushing capacity is a very desirable feature, springs foracceleratingthe down stoke of the stamp heads, will be used. In thepresent invention these springs 40, usually of a conical shaped voluteform will be attached by means of the turning heads 41, to the upperends of the stamp stems 9, so that the turning movement of said stemsmay take place independently of such springs.

42,is a verticallyadj ustable head arranged above the springs 40,and inthe path thereof, so that as saidA springs are raised in the upwardmovement of the stamp stems, the springs will be first brought incontact with such heads 42, and then compressed against the same, sothat as the stamp stems begin to descend, the force stored up in suchsprings will be brought into action to impart an accelerated downwardstroke tosuch stems and the stamp heads at the lower end of the same.

To vary the amount of compression, as well as to compensate fdr thedescent of the stamp stem, dac., due to gradual wear of the stamp headin use, the spring abutment head 42, is made vertically adjustable uponthe main uprights or posts 1 and 2, by means of ratchet bars 43, securedthereto, ratchet dogs 44, on the top of the abutment head 42, andclamping bolts 45, that hold the ratchet dogs 44, and ratchet bars 43,at any desired adjustment to which they may be set.

Having thus fully described my said invention, what I claim as new, anddesire to secure by Letters Patent, s

1. A stamp mill comprising in combination a reciprocatingstem carrying astamp head, a cam tappet secured to the stamp stem, an actuating camhaving an annularly arranged cam face and adapted to revolve around theaxis of the stamp stem, independently of the reciprocation of the same,and means for imparting a differential rotation to the cam and camtappet in the same direction, substantially as set forth.

2. A stamp mill, comprising in combination, a reciprocating stemcarrying a stamp head, a cam tappet secured to the stamp stem, anactuating cam, having an annularly arranged cam face and adapted torevolve around the axis of the stamp stem, independently of the-reciprocation of the same, and means for imparting a differential andcontinuous rotation to the cam and cam tappet in the same direction,substantially as set forth.

3. A stamp mill, comprising in combination, a reciprocating stemcarrying'a stamp head, a cam tappet secured to the stamp stem, anactuating cam, having an annularly arranged cam face and adapted torevolve around the axis of the stamp stem, independently of the'reciprocation of the same, and means for impart ing a dierential andcontinuons rotation to the cam and cam tappet in the same direction, theadjacent faces of the cam and cam tappet being made of a counterpartformation, substantially as set forth.

4. A cluster stamp mill, comprising in cornbination, a series of dies, aseries of reciprocating stamp heads and stems, a series of cam tappetssecured to stamp stems, a series of actuating cams'having annularlyarranged vcam faces, and adapted to revolve around the axes of the stampstems independently of the reciprocation of the same, and means forimparting a differential and continuous rotation to the cams and camtappets in the same direction, the same consisting of the centrallyarranged driving shafts 12 and 27, each carrying a spur gear 13, 26, theduplicate cluster of spur gears 14, 25, attached to the cam and camtappet and means for imparting 4differential rotation t-o the shafts 12and 27, substantially as set forth.

5. A cluster stamp mill, comprising in combination, a series of dies, aseries of reciproeating stamp heads and stems, a series of actu-V atingcams having annularly arranged cam ICO IIO

faces, and adapted to revolve around the axes of the stamp stemsindependentlyv of the reciprocation of the same, and means for impartinga differential and continuous rotation to the cams and cam tappets inthe same direction, the same consisting of the centrally arrangeddriving shafts, 12 and 27, each carrying a spur gear 13, 26, theduplicate cluster of spur gears 14, 25, attached to the cam and camtappet, the countershafts 28 and 33, pair of bevel gears 29 and 30, andpulleys 3l and 32, substantially as set forth.

6. A cluster stamp mill, comprisingr in combination, a series of dies, aseries of reciprocating stamp heads and stems, a series of cam tappetssecured to the stamp stems, a series of actuating cams connected to thestamp stems by a key and keyway so as to admit of the independentreciprocation of said stamp stems, a series of springs carried by thestamp stems, and an adjustable abutment plate arranged in the path ofsaid springs, substantially as set forth.

'7. A cluster stamp mill, comprising in combination, a series of dies, aseries of reciprocating stamp heads and stems, a series of cam tappetssecured to the stamp stems, a series of actuating cams connected to thestamp stems by a key and keyway so as to admit of the independentreciprocation of said stamp stems, a series of springs carried by thestamp stems, and an abutment plate arranged in the path of said springs,and made adjustable by means of the ratchet bars, 43, ratchet dogs 44and clamping bolts 45, substantially as set forth.

8. Astamp mill, comprising in combination a die, a reciprocating stemcarrying a stamp head, a cam tappet secured to the stamp stem, a liftingcam for the same, a spring carried by the stamp stem, and an adjustableabutment plate arranged in the path of the spring, substantially as setforth.

9. A stamp mill, comprising in combination, a die, a reciprocating stemcarrying a stamp head, a cam tappet secured to the stamp stem, a liftingcam for the same, a spring carried by the stamp stem, and an abutmentplate arranged in the path of the spring and made adjustable by means ofthe ratchet bars 43 ratchet dogs 44 and clamping bolts 45,'substantiallyas set forth.

10. A stamp mill, comprising in combination, a die, a reciprocatingstamp head and stem, an operating cam, and a cam tappet secured to thestamp stem by collars 19 and 20, made vertically adjustable by means ofthe pin 23, the series of notches 21, in the stem, and the vertical pairof orifices 22, in the collars 19 and 20, the orices 22, being fartherapart than the notches 21, substantially as set forth.

11. A stamp mill, comprising in combination, a die, a reciprocatingstamp head and stem, an operating cam, a cam tappet secured in place bymeans of collars 19 and 20, and a cushion 24, interposed between thecollar 20, and the under side of the cam tappet, substantially as setforth.

12. A stamp mill, comprising in combination, a die, reciprocating stamphead and stem, an operating cam, a cam tappet secured in place by meansof collars 19 and 20, a cushion 24, interposed between the collar 20,and the under side of the cam tappet, the stamp stem being madevertically adjustable with relation to the cam tappet by means of thepin 23, the series of notches 2l, in the stem, and the vertical pair oforifices 22, in the collars 19 and 20, the orifices 22, being fartherapart than the notches 21, substantially as set forth.

13. A cluster stamp mill, comprising in combination, a centrallyarranged driving shaft, a cluster of stamp heads and stems arrangedconcentrically therewith, a series of lifting cams and tappetsindividual to the series of stamps, and means for imparting motion fromthe central driving shaft to the series of cams, substantially as setforth.

14. A clusterstamp mill, comprising in combination, a centrally arrangeddriving shaft, a cluster of stamp heads and stems arrangedconcentrically therewith, a series of lifting cams and tappetsindividual to the series of stamps, and means forimparting motion fromthe central driving shaft to the series of cams, the same consisting ofa single driving spur gear on the central driving shaft, and individualgears on the lifting cams, that mesh with and are driven by the singledriving gear, substantially as set forth.

15. A cluster stamp mill, comprising in combination, a main supportingframe, a centrally arranged driving shaft, a cluster of stamp heads andstems arranged concentrically therewith, a series of cam tappets securedto the stamp stems, means whereby such tappets are held from rotatingwith the stems,a series of lifting cams connected to the stamp stems bya key and keyway, so as to admit of the independent reciprocation ofsuch stems, and means for imparting motion from the central drivingshaft to the series of cams, substantially as set forth.

16. Acluster stamp mill, comprising in combination, a main supportingframe, a centrally arranged driving shaft, a cluster of stamp heads andstems arranged concentrically therewith, a series of cam' tappetssecured to the stamp stems, means whereby such tappets are held fromrotating with the stems, a series of lifting cams connected to the stampstems by a key and keyway, so as to admit of the independentreciprocation of such stems, and means for imparting motion from thecentral driving shaft to the series of cams, the same consisting ofasingle driving spur gear on the central driving shaft, and individualgears on the lifting cams that mesh with and are driven by the singledriving gear, substantially as set forth.

17 Acluster stamp mill, comprising in com- IIO bination, a main framehaving Y shaped hori zontal tie members, a cluster of stamp heads andstems, supported in guide boxes on the exterior vertical faces of vsuchmembers, so as to admit of ready removal and replacement of any onestamp, a series of lifting cams and tappets individual to the series ofstamps, and means for imparting motion to the cams, substantially as setforth.

18. A cluster stamp mill, comprising in combination, a main frame havingY shaped horizontal tie members, a cluster of stamp heads and stems,supported in guide boxes on the exterior vertical faces of such members,a series of lifting cams and tappets individual to the series of stamps,means for imparting motion to the same, and a waste chamber, formedimmediately beneath the lower horizontal tie member 5, to prevent thedownward passage of the lubricant, substantially as set forth.

19.A A cluster stamp mill, comprising in combination, a main supportingframe, a centrally arranged driving shaft, a cluster of stamp heads andstems arranged concentrically therewith, a series ot' cam tappetssecured to the stamp stems by means of collars 19 and 20, means wherebysuch tappets are held from rotating with the stamp stems, cushions 24,interposed between the collars 2O and the under side of the tappets, aseries of lifting cams connected to the stamp stems by a key and key wayso as to admit of the independent reciprocation of such stems, and meansfor imparting motion from the central driving shaft to the series ofcams, substantially as set forth.

20. A cluster stamp mill, comprising in combination, a main supportingframe, a centrally arranged driving shaft, a cluster of stamp heads andstems arranged concentrically therewith, a series of cam tappetssecured` to the stamp stems by means of collars 19 and 20, and madeadjustable with relation to each other by mea-ns of the pin 23, theseries of notches 2l in the stems, and vertical pairs of orifices 22 inthe collars 19 and 20, the orifices 22 being farther apart than thenotches 21, means whereby such tappets are held from rotating with thestamp stems, cushions 24, interposed between the collars 25 and theunder side of the tappets, a series of lifting cams connected to thestamp stems by a key and keyway so as to admit of independentreciprocation of such stems, andmeans for imparti-ngmotion from thecentral driving shaft to the series of cams, substantially as set forth.

In testimony whereof witness my hand this `17th day of August, 1894.

GEORGE M. GROSS.

In presence of- ROBERT BURNS. JOHN ENDERS, .I r.

